Coating Paint Thickness Gauge Auto Recognition LCD Backlit Display Car Coating Thickness Tester Mil Meter Item Type: Coating Paint Thickness Gauge Material: ABS Probe Type Fe probe (iron based) Fe+Zn (galvanized based) NF probe (non magnetic substrates such as aluminum copper) Principle Electromagnetic induction Eddy current effect Measuring Range  0~1500μm 0~59.1mil 0~1500μm 0~59.1mil Accuracy ± (3%+2μm) ± (3%+0.08mil) ± (3%+2μm) ± (3%+0.08mil) Resolution 0.1 μm/0.01mil 0.1 μm/0.01mil Calibration Zero calibration; Multipoint calibration Unit μm, mil Minimum Convex Curvature Radius 1.5mm/0.06in Minimum Concave Curvature Radius 25mm/0.98in Minimum Measurement Area Diameter 6mm/0.24in Minimum Substrate Thickness 0.5mm(0.02in) 0.3mm(0.012in) Power Supply AAA x 2 (shipped without battery) Operating Environment Battery temperature: -20-40 ℃ (-4-104℉) Humidity: 20%~90% RH; No strong magnetic field